Improvement in sandpapering polish ing-mach ines



H. A. BAUHELDER. Sand-Pampering Polishing Machine.

No. 210,287. Patented Nov. 26, 1878-.

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UNITED STATES PATENT OEEIoE.

HENRY A. BAOHELDER, OF WEST WATEItVILLE, MAINE.

IMPROVEMENT IN SANDPAPERING POLISHING-MACHINES.

Specification forming part of Letters Patent No. 210,287, datedNovc1nber26, 1878; application filed October 30, 1878.

To all whom it may concern:

Be it known that I, HENRY A. BACHEL- DER, of West Waterville, in thecounty of Kennebec and State of Maine, have invented certain new anduseful Improvements in Sandpapering Polishing Machinery; and I dohereon, which form a part of this specifimtion.

Figure 1 shows an end elevation of my machine, looking from the front,which I will call the left-hand end, as shown in Fig.2, aside elevation.Fig. 3 is a detail section, showing the manner of supporting the rearend of the bed of the machine.

My invention relates to improvements in sandpapering-1nachines, and hasfor its object the smoothing or sandpapering of certain articles of woodby means of a revolving wheel, the surface of which is cushioned andcovered with sand-paper or similar material, and under which is made topass, with a continuous motion, an endless belt or apron, upon which areplaced the articles to be smoothed, their upper surface coming incontact with the sanded wheel above.

In the drawing, A is a sanded wheel or' drum, the cross-section of whichis made to conform to the article to be smoothed-in this case, achair-bottom, which I have taken as an illustration. Passing under thewheel A is the endless belt or apron B, stretched upon the two drums Gand 0, one at each end of the machine. These two drums O and G aresupported by the frame-work or, as I shall call it, the bed E.

The bed E is supported at its four corners as follows: The two cornersat the front end, 0, are supported on trunnions, which allow a hingedmotion at that end, while at the other end, 6, it is supported by acombination of screws and springs, by which that end of the bed israised and lowered, and which I will now describe by Fig. 3.

E, in Fig. 3, is one of the back-end posts of the bed E, where it entersthe opening a in the frame-work of the machine. This post E rests upon arnbberring, 0', which is supported by the square nut i, kept fromturning by the sides of the opening 0.

The nut 71, and with it the rubber ring 1" and the post E, with its endof the bed E, are raised and lowered by means of the screw 1, whichpasses through the nut t', and is itself held from slipping down by theshoulder k.

Operating the screw 1 are the bevel-gears P, moved by the crank It. Thisarrangement exists under both the rearposts of the bed E, as shown bythe position of P and P, in Fig. 1.

F, G, H, I, J, K, and L are pulleys, Gr and H, I and J, K and L beingconnected by belts. The belt from K to L is crossed, while the othersare straight.

M is a cogged wheel, engaging the larger cogged wheel N, which isattached to the same shaft as the drum 0. A is the shaft on which wheelA is mounted.

Having explained the parts of my invention, I will now proceed toexplain its mode of operation.

The power being applied to the pulley F, the wheel A is revolvedrapidly. The motion of the shaft A is carried through the pulleys G H IJ K to L, being reduced at each pul ley. The same shaft which carriespulley L carries also the small cogged wheel M. This cogged wheel Mengages the cogged wheel N, still further reducing the motion 5 and fromN the motion is applied directly to the drum 0, by which the endlessbelt B and the drum 0 are moved and the feed produced. The endless beltB runs in two grooves-one in the top rail of each side of the bed E, asshown in Fig. 1. The article to be smoothed is placed on the moving beltB, secured by brads or other suitable means, with the face to besmoothed upward, and passed or fed under the wheel by the uniform motionof the belt 13.

It will be seen that the motion of the belt must always be contrary tothat of the under side of the wheel A.

Previously to smoothing an article the height of the bed is to beregulated as follows: Turning the crank B one way or the other carriesthe nut 41 up or down, by means of the screw 1 and the bevel-gears P.The nut z",

moving upward, carries with it the rubber ring 1', which raises the postE, thus raising the end of the bed E which comes under the wheel. lVhenthe nut 13 is lowered, the weight of the bed E carries the rubber ring4' down with it.

The purpose of the rubber ring 7', above described, for which may besubstituted a suitable spring of other material, is to furnish thenecessary elasticity between the wheel A and the bed 1], which isindispensable in such an operation as described, owing to the smallinequalities in surface of the wood to be smoothed, and also of thewheel itself.

My invention is intended to be applied to the smoothing of chair andsettee bottoms, doors, panels, and the like, or of any articles of woodwhich have flat surfaces or continuous cross-section.

The advantages which my invention possesses over other methods of doingthis work are, that while doing the work in a rapid manner, it producesgreat smoothness and regularity of surface by means of the uniform feedand the elasticity given by the rubber ring 1.

I claim as my invention 1. In a sandpapering-maehine, substantially asdescribed, the combination of the frame or bed E with the hinged supportat end 0 and the support 6 at the other end, adjustable by nut i. screwZ bevel-gear 1, and crank R, substantially as and for the purposes setforth.

2. In combination with the frame or bed E, the screw 1, supporting-nut6, rubber ring or spring '1', bevel-gear I, and crank R, substantiallyas and for the purposes set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

HENRY A. BAOI'IELDER. WVitnesses:

S. W. BATES, H. W. STEWART.

